Automatic transmitter for telegraphic systems.



J. GBLL. AUTOMATIC TRANSMITTER FOR TELEGRAPHIG SYSTEMS.

APPLICATION FILED JAN.24, 1911. RENEWED FEB. 21, 1013. 1&77531 5.,-

Patented Oct. 7, 1913.

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J. GELL.

AUTOMATIC ERANSMITTER FOR TELEGRAPHI C SYSTEMS.

APPLICATION rum) JAN. 24, 1911. RENEWED FEB. 21, 1913.

ag fi'i fifil 5 Patented Oct. 7, 1913.

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ngipiication iiieci January 2%,

ToaZZ whom it may concern:

Be it known that 1, Joint G'ELL, a citizen of the United States,residing-at London England, have invented certain new and usefulimprovements in Automatic Trans niitters for Telegraphic Systems, ofwhich the following is a specification.

My present invention relates to the forms of automatic transmittersdisclosed by me in Letters Patent of the United States #835,750,November 13, 1906, and 890,042, June 9, 1908, and it consists in thefeatures and combination and arrangement of parts hereinafter describedand particularly pointed out in the claims.

In the drawings Figure 1 is a front view oi a transmitter embodying myimprovement; 1 is a detail view; Fig. 2 is a plan view of theinstrument; Fig. 3 is a vertical sectionai view showing drivingmechanism in elevation; Fig. 4: is a perspective View of a double cam orsegmental wheel; Fig. is a view of a modified form of main and secondarykey action.

is in the patents above referred to, I employ a star teed wheel 1 toengage the feed hoies in the tape for feeding it along to present itssignal holes to a pair of transmitting pins 2, 2 These pins arepivotally mounted resbcctiveiy on the members 3, 3 of the main keyaction, which inembers are pivoted at i to the casing or frame of theapparatus. These members 3, 3 are opblock of double -form, Fig. 4, onemember 5 of which operates the front main key member 3 and the othermember 5 of which, set at a quarter turn from that of the first memher,operates the rear main key member 3*. This divided cam 5, 5 has abruptshoulders and segmental portions '6 which latter are concentric with thedrive shaft of the cam member, and this is true also of the low parts ofthe cam. The key members are operated to press the transmitting pinsupwardly by springs 7, one for each member, only one appearing in Fig.1, and the high arts of the cam member by acting on the teeth 8 of thekey members force the transmitting pins downwardly. The pins passthrough the. signal holes in the tape when any of these are presented tothe pins as they are pressed upwardly, and at such times signal impulsesare sent over the line,

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should however, an iinp'erforat'e part of the tape come over thetransmitting pin as t-gie snrings exert their ior ce to raise them, tieparts w ll be prevented from r sing-"and ho signal will he sent, thesefeatures be ng substantially the same as in the patents men'- tioned. vr V The portion or my present improveme 8; now to be described referspantiohlairl3 so the singie ad doube current syste n is ciosed in ,myatent 890,0i2, referred to, and is as follows": The main key members arecombined with hammers 8, 8%, to have a hammer or striking action on thesec oiidai'y hey memioenwhich is pivotal ly mounted in a frame bracket.at 9, and. made 11 of arms 9 9 and an arm 9 attached to fut insulatedfrom the arms 9 9 The hammers are ti ppeol with ivory or other substancefor in suiati'on, and instead or" carrying these haminers directly onthe members 3, 3 of the main key action, I mount them on active portionsof the main key action, consisting of the subsidiary members 3 3 ofright angular form and pivotally mounted on they frame or casing. Thesubsidiary portion 3? of the front main key action is connected with thepivoted member 3 by a. link 10, while the subsidiary portion 3 of therear key action is connected with the member 3* by a pin and forkconnection 11,'Fig. 1. The hammers of the main thearmsQ 9* of thesecondary key an oscillate it to make the propenccntacts for doublecurrent Working, the effect insemiing the impulses being the same as inthe Patent 890,042. I

The battery isillustrated atvB, hav ng its negative, terminal connectedwith the block 12 and its positive terminalconnecte with the block 18. Ih

In the positi'on of the parts shown in Fig. 1, the secondarjr lever isengaging contact 13, and. the positive current passes through block 13,contact 13 arm 9 of secondary key, to the plug E connected With earth,and the negative current goes through block 12, contact. 12, arm 9 ofthe secondary key to line through the pivot of said key. and, the framebracketor through connection L .to line. 'Whenihe hummer 8 strikes thearm 9 of the secondary key, and turns the said key, the positive currentwill flow through block 13, Contact 13, arm W to line L, and the negakeyaction strik;i

tive currrent Will pass through block 12, contact 12, arm 9 of secondarykey to earth.

I provide a jockey roller 14 carried by a spring arm 15 to aid insecuring a prompt and firm contact of the-secondary key with thecontacts of the blocks 12 and 13, and to maintain the connection vat thetime of reversal, said roller engaging the knife-edge end oft/he arm 9'The spring arm 15 is secured. adjustably to a block 16 attached toa'plate 17 supported on and insulated from the frame, as shown,adjusting screws 18 passing through slots in the spring arm, so that byadjusting these screws the arm can be tipped slightly on the edge 19 ofsaid block 16. By this the jockey roller may be adjusted toward" the endof the arm 9 to have more or less firm pressure thereon. The spring arm15 is also adjustable longitudinally in order to position the jockeyroller in proper relation to the secondary key. For this purpose Iprovide a screw 19 passing through a post 20 on the frame, and adaptedto be turned by a suitable inslsrw ment, so that after loosening thescrews 18 and turning the screw it), the arm 15 will be borne upon andadjusted to any degree of fineness by a partial turn of the screw 19.and for setting the arm back the screw 19 can be first, adjusted and thearm 15 forced back against it, and then the screws 18 are tightened tohold the arm securely in its ad justcd position,

Itwill be observed that while I employ the hammer action of the main keymen'il'iers upon the secondary key, the same as in my prior Patent890,042,.1 have so organized the parts that the secondary key operatesin a vertical plane parallel with or coincident to the plane in whichthe mei'nbers of the main. key action work, instead of. as in saidpatent, at right angles thereto, and this plane also, instead of being;at right a ngles to the casing or frame, is parallel to the face of theframe or casing, so that all of the parts of the secondary key action,with its contacts, are located on the outer face of the frame, wherethey are accwssible for adjustment, cleaning, and for rigidity andsimplicity in constructioi'i. The secondary key action is mounted on thevulc'anitc block defined by the black line 2 Fig. 1, and this is linedto the casing or frame which forms a solid backing therefor throughout;its extent.-

ln my present form in the form shown in my Patent 890,042. the pincarrying POP tions 3, 3, of the main key members are arranged side byside, and in comparatively close proximity, while the active or hammercarrying portions of said main key action, like in said patent, arespread apart to locate the hammers in se 'iarated positions to actagainst the arms of the secondary key action. In effect, therefore, theactive hammer carrying portions 3* '3 form extensions or continuationsofthe pin carrying portions 3, 3, in the one case an intermediateconnecting link being used, and in the other case the pin and forkconnection being employed.

In Fig. 5 I show another form of key action in which thetransmitting-pin-carrying portions 3, 3", of the main key are verticallyarranged, and have arms extending at right angles thereto to which thetransmitting pins are pivoted, while the active or hammer carryingportions 3 3 of the main key are straight pieces pivoted intermediate oftheir length, and have their adjacent ends connected by links 10with'the members 3 3 respectively, the hammers being carried at theiropposite ends. The secondary key is substantially the same as that abovedescribed. This form possesses all the ad vantages of the form firstdescribed, and in addition it presents a well balanced organization foruniform working and prompt-- ness and firmness of contact.

l'n both the forms above described the transmitting pins are pressedtoward the right by springs against. stops, one of each of which isshown at 21 and 22, respectively.

It will be understood that withthe cam having the abrupt shoulders andthe concentric high and low parts, and with the.

members of the main key action having the han'nncrs, the secondary key,when subjected to the bamme' action, will. be promptly 0perated and notonly forced firmly against its cont-.urls by the action of the hammers,bnt will be held by the springs for a definite period of either Contacton or contact off, the, concentric low part of the cam permitting thisactionf The jockey roller aids in securing the prompt and firm contact.By removing the arm 9 from the secondary key 9 9, the instrument becomesa single contact transmitter."

Driving 7rwclzr.mism.-' lhe apparatus is driven from any suitable motorthrough a shaft 2?), Figs. good 3, carrying a friction drive disk 24l'iearing upon a disk 25 on a shaft 26. This disk 25, through a frictionwheel 27, drives another friction disk 28 on the shaft 29, and on thisis a gear wheel 30 meshing; with a rear 31 mounted on the shaft 82journalcd in the casing, and in a bracket 33, Fig. 2, and upon thisshaft the double cam 5, 5 is mounted. The shaft 32 has fixed thereto apinion 34 meshing with a gear 35 on the shaft 36 of the star-feedviheel. By this train of gearing the starfeed wheel and the cam 5, 5 aredriven in proper time with each other. The friction disks and Wheels arekept in proper driving contact by a spring 37 in a casing 38 fixed tothe frame, said spring surrounding the end of the shaft- 29 and pressingin a ring or disk 39 loose on said shaft, and bearing upon antifrietion'balls 40 carried by 'a ring 41,

said balls, in turn, bearing upon a ring or flange 42, the sleeve 13 ofwhich is pinned at 4A to the shaft :29. For varying the speed of thedrive, the driving friction Wheel 25 is mounted adj ustably on the motorshaft 28, so that by loosening the screw the Wheel may be set indifferent positions to- Ward or from the center of rotation of the disk25. The transmission friction Wheel 27 is mounted in a hanger 46 throughwhich a screw threaded rod 4:7 passes. This rod or shaft turns inbearings in brackets 4:8, 49, being held against longitudinal movementby collars 5O pinned on the shaft. By turning the screw shaft the Wheelbracket 27 may be adjustedin respect to the centers of rotation of thefriction disks 25 and 28 to vary the speed of transmission. A scale 51is supported on the brackets 48 and 49, and a mark on the hanger 4:6will register with the scale marks to secure fineness of adjustment.

It will be understood that the hanger 46 of the intermediate frictionWheel 27 permits the proper pressure to be secured between the frictionsurfaces, this hanger being free to turn about the screw shaft, thoughno appreciable turning movement takes place in securing adequatepressure for transmission.

I claim 1. In apparatus of the class described, a frame, a star feedWheel, transmitting pins,

spring pressed pivoted members carrying the ins and subsidiar members,ivoted inter- P P mediate of their length, links connecting theadjacent ends of the subsidiary levers with the pin carrying members,said subsidiary members having hammer port-ions at their outer ordistant ends, and a secondary key operated by said hammer portionssubstantially as described. 7.

3. In combination the main and secondary key actions, a jockey roller,an arm carrying the same, screws for adjustably holding the arm and ascrew for forcing the armlongitudinally to adjust the jockey roller inrelation to the secondary key or to form a stop for the adjustment ofthe arm in the opposite direction, substantially as described.

In testimony whereof, I ailix my signature in presence of two Witnesses.

JOHN GELL. Witnesses:

EDWARD N. SARTON, BENNETT S. JONES.

action comprising.

